Did mine two years ago so not sure how much help I'll be but here goes:
1) How long do the Sim and Aircraft sections of the course take, respectively?
MEP a week, sim 2 weeks A/C about 2-3 weeks.
2) How long do the sorties/sessions last in the air and in the Sim?
sim starts off 1 hour then goes to 2 hours, I hated it as I just couldn't trim the thing but I used it for what it is and learnt the procedures.
3) Did you usually fly/have a Sim session every day?
Yes apart from the usual sim/aircraft going tech poo weather etc.
4) How much home or "out of school" study did you do?
5) How useful was it back seating other flights.
Honestly for me not very but I always went and would always recommend going, CPL I found it very good.
6) Did your training schedule go to plan? (Were there any tech issues, weather delays or additional training required)
Nope, and we had a brand new A/C, that's flying though.
I found it easier than the CPL as my instructor said it's on rails, your always tracking too or from something. It did help me I was already instructing myself before I did it, my flying was at a high standard, any questions no matter how dumb they seem feel free to PM me.
Good luck
Scan, Trim, Relax.